c#内存流到文本文件未完成

我在c#中使用大型文本文件函数的内存流时遇到了问题。输出文本文件不包含所有信息，它缺少我在streamwriter中写入的最后几行文本。

许多帖子说使用stream.flush()并使用stream将流重置到流的开始。查找(0,seekOrigin.End)，但两者似乎都没有区别。

代码如下:

using (var stream = new MemoryStream())
        {
            using (var sb = new StreamWriter(stream))
            {
                Decimal[,] oparray = new decimal[477, 521];
                List<Rech_RCH_Result> result1;
                //RCH File Header
                sb.WriteLine("#MODFLOW2000 Recharge Package");
                sb.WriteLine("PARAMETER 0");
                sb.WriteLine("         1        50");
                for (int sp = 1; sp < 3; sp++)  //should be 209
                {
                    ObjectResult<Rech_RCH_Result> qryRCH = db.Rech_RCH(NRD, sp);
                    result1 = qryRCH.Select(p => new Rech_RCH_Result { M_Col = p.M_Col, M_row = p.M_row, Recharge = p.Recharge, StressPeriod = p.StressPeriod }).ToList();
                    //Stress Period Header for SP
                    sb.WriteLine("         1         1");
                    sb.WriteLine("        18     1.000(10e15.6)                   -1     RECHARGE");
                    //model row = 1 to 476, col = 1 to 520
                    foreach (Rech_RCH_Result s in result1)
                    {
                        oparray[s.M_row.Value, s.M_Col.Value] = s.Recharge;
                    }
                    for (int x = 1; x < 477; x++)
                    {
                        for (int y = 1; y <= 520; y += 10)
                        {
                            //write out values in chunks of 10
                            sb.WriteLine(string.Format("   {0:0.000000E+00}   {1:0.000000E+00}   {2:0.000000E+00}   {3:0.000000E+00}   {4:0.000000E+00}   {5:0.000000E+00}   {6:0.000000E+00}   {7:0.000000E+00}   {8:0.000000E+00}   {9:0.000000E+00}", oparray[x, y], oparray[x, y + 1], oparray[x, y + 2], oparray[x, y + 3], oparray[x, y + 4], oparray[x, y + 5], oparray[x, y + 6], oparray[x, y + 7], oparray[x, y + 8], oparray[x, y + 9]));
                        }
                    }
                    Array.Clear(oparray, 0, oparray.Length);
                }
                stream.Flush();
                //Looks like the stream is not completing and missing a few lines.
                //stream.Seek(0, SeekOrigin.Begin);
                stream.Seek(0, SeekOrigin.End);

                using (FileStream file = System.IO.File.Create(Server.MapPath(string.Format("~/RCHFiles/{0}.txt", filename))))
                {
                    stream.WriteTo(file);
                }
                //using (ZipFile zip = new ZipFile())
                //{
                //    zip.AddEntry(filename + ".RCH", stream);
                //    zip.Save(Server.MapPath(string.Format("~/RCHFiles/{0}.zip", filename)));
                //}
            }
        }